<div class="act">
    <ul>
        <li><a href="<?php echo $base_url;?>/index.php/m/index/lucky" class="link1"><img src="<?php echo $base_url;?>/style/m/images/public-btn1.png" alt=""></a></li>
        <li><a href="./m-index-2.html" class="link2"><img src="<?php echo $base_url;?>/style/m/images/public-btn2.png" alt=""></a></li>
        <li><a href="./m-index-3.html" class="link3"><img src="<?php echo $base_url;?>/style/m/images/public-btn3.png" alt=""></a></li>
        <li><a href="#" class="link4"><img src="<?php echo $base_url;?>/style/m/images/public-btn4.png" alt=""></a></li>
    </ul>
</div>